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<?php final class Thing { private string $state; public function __construct() { $this->state = 'foo'; } public function __set(string $property, $value) : void { if ((\debug_backtrace()[1]['object'] ?? null) !== $this) { throw new \Exception('nope'); } $this->$property = $value; } } $thing = new Thing(); var_dump($thing); $thing->state = 'this should never be allowed';
Output for git.master, git.master_jit, rfc.property-hooks
object(Thing)#1 (1) { ["state":"Thing":private]=> string(3) "foo" } Fatal error: Uncaught Exception: nope in /in/RiOcF:13 Stack trace: #0 /in/RiOcF(24): Thing->__set('state', 'this should nev...') #1 {main} thrown in /in/RiOcF on line 13
Process exited with code 255.

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